<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
<head>
<!-- Copyright 1997 The Open Group, All Rights Reserved -->
<title>gmtime</title>
</head><body bgcolor=white>
<center>
<font size=2>
The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

</font></center><hr size=2 noshade>
<h4><a name = "tag_000_005_857">&nbsp;</a>NAME</h4><blockquote>
gmtime, gmtime_r - convert a time value to a broken-down UTC time
</blockquote><h4><a name = "tag_000_005_858">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="time.h.html">time.h</a>&gt;

struct tm *gmtime(const time_t *<i>timer</i>);
struct tm *gmtime_r(const time_t *<i>clock</i>, struct tm *<i>result</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_005_859">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>gmtime()</i>
function converts the time in seconds since the Epoch pointed to by
<i>timer</i>
into a broken-down time, expressed as Coordinated Universal Time (UTC).
<p>
The
<i>gmtime()</i>
interface need not be reentrant.
<p>
The
<i>gmtime_r()</i>
function converts the calendar time pointed to by
<i>clock</i>
into a broken-down time expressed as Coordinated Universal Time (UTC).
The broken-down time is stored in the structure referred to by
<i>result</i>.
The
<i>gmtime_r()</i>
function also returns the address of the same structure.
</blockquote><h4><a name = "tag_000_005_860">&nbsp;</a>RETURN VALUE</h4><blockquote>
The
<i>gmtime()</i>
function returns a pointer to a
<b>struct tm</b>.
<p>
Upon successful completion,
<i>gmtime_r()</i>
returns the address of the structure pointed to by the argument
<i>result</i>.
If an error is detected, or UTC is not available,
<i>gmtime_r()</i>
returns a NULL pointer.
</blockquote><h4><a name = "tag_000_005_861">&nbsp;</a>ERRORS</h4><blockquote>
No errors are defined.
</blockquote><h4><a name = "tag_000_005_862">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_005_863">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
The
<i><a href="asctime.html">asctime()</a></i>,
<i><a href="ctime.html">ctime()</a></i>,
<i>gmtime()</i>
and
<i><a href="localtime.html">localtime()</a></i>
functions return values in one of two static objects: a
broken-down time structure and an array of
<b>char</b>.
Execution of any of the functions may overwrite the information returned in
either of these objects by any of the other functions.
</blockquote><h4><a name = "tag_000_005_864">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_005_865">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="asctime.html">asctime()</a></i>,
<i><a href="clock.html">clock()</a></i>,
<i><a href="ctime.html">ctime()</a></i>,
<i><a href="difftime.html">difftime()</a></i>,
<i><a href="localtime.html">localtime()</a></i>,
<i><a href="mktime.html">mktime()</a></i>,
<i><a href="strftime.html">strftime()</a></i>,
<i><a href="strptime.html">strptime()</a></i>,
<i><a href="time.html">time()</a></i>,
<i><a href="utime.html">utime()</a></i>,
<i><a href="time.h.html">&lt;time.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
<i>gmtime()</i> derived from Issue 1 of the SVID.
<P>
<i>gmtime_r()</i> derived from the POSIX Threads Extension (1003.1c-1995).
</blockquote><hr size=2 noshade>
<center><font size=2>
UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]

</font></center><hr size=2 noshade>
</body></html>

